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<FONT color="green">001</FONT>    <a name="line.1"></a>
<FONT color="green">002</FONT>    /*<a name="line.2"></a>
<FONT color="green">003</FONT>     * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<FONT color="green">004</FONT>     *<a name="line.4"></a>
<FONT color="green">005</FONT>     * $Id: Primitive.html 4 2011-02-05 22:22:47Z archie.cobbs $<a name="line.5"></a>
<FONT color="green">006</FONT>     */<a name="line.6"></a>
<FONT color="green">007</FONT>    <a name="line.7"></a>
<FONT color="green">008</FONT>    package org.dellroad.stuff.java;<a name="line.8"></a>
<FONT color="green">009</FONT>    <a name="line.9"></a>
<FONT color="green">010</FONT>    import java.lang.reflect.InvocationTargetException;<a name="line.10"></a>
<FONT color="green">011</FONT>    import java.lang.reflect.Method;<a name="line.11"></a>
<FONT color="green">012</FONT>    import java.util.HashMap;<a name="line.12"></a>
<FONT color="green">013</FONT>    <a name="line.13"></a>
<FONT color="green">014</FONT>    /**<a name="line.14"></a>
<FONT color="green">015</FONT>     * Simple utility enumeration for working Java {@link Class} instances representing primitive types.<a name="line.15"></a>
<FONT color="green">016</FONT>     *<a name="line.16"></a>
<FONT color="green">017</FONT>     * &lt;p&gt;<a name="line.17"></a>
<FONT color="green">018</FONT>     * Instances of this class represent one of the eight Java primitive types.<a name="line.18"></a>
<FONT color="green">019</FONT>     * &lt;p/&gt;<a name="line.19"></a>
<FONT color="green">020</FONT>     */<a name="line.20"></a>
<FONT color="green">021</FONT>    public enum Primitive {<a name="line.21"></a>
<FONT color="green">022</FONT>    <a name="line.22"></a>
<FONT color="green">023</FONT>        BOOLEAN(Boolean.TYPE, Boolean.class, 'Z') {<a name="line.23"></a>
<FONT color="green">024</FONT>            public &lt;R&gt; R visit(PrimitiveSwitch&lt;R&gt; pswitch) {<a name="line.24"></a>
<FONT color="green">025</FONT>                return pswitch.caseBoolean();<a name="line.25"></a>
<FONT color="green">026</FONT>            }<a name="line.26"></a>
<FONT color="green">027</FONT>        },<a name="line.27"></a>
<FONT color="green">028</FONT>        BYTE(Byte.TYPE, Byte.class, 'B') {<a name="line.28"></a>
<FONT color="green">029</FONT>            public &lt;R&gt; R visit(PrimitiveSwitch&lt;R&gt; pswitch) {<a name="line.29"></a>
<FONT color="green">030</FONT>                return pswitch.caseByte();<a name="line.30"></a>
<FONT color="green">031</FONT>            }<a name="line.31"></a>
<FONT color="green">032</FONT>        },<a name="line.32"></a>
<FONT color="green">033</FONT>        CHARACTER(Character.TYPE, Character.class, 'C') {<a name="line.33"></a>
<FONT color="green">034</FONT>            public &lt;R&gt; R visit(PrimitiveSwitch&lt;R&gt; pswitch) {<a name="line.34"></a>
<FONT color="green">035</FONT>                return pswitch.caseCharacter();<a name="line.35"></a>
<FONT color="green">036</FONT>            }<a name="line.36"></a>
<FONT color="green">037</FONT>        },<a name="line.37"></a>
<FONT color="green">038</FONT>        SHORT(Short.TYPE, Short.class, 'S') {<a name="line.38"></a>
<FONT color="green">039</FONT>            public &lt;R&gt; R visit(PrimitiveSwitch&lt;R&gt; pswitch) {<a name="line.39"></a>
<FONT color="green">040</FONT>                return pswitch.caseShort();<a name="line.40"></a>
<FONT color="green">041</FONT>            }<a name="line.41"></a>
<FONT color="green">042</FONT>        },<a name="line.42"></a>
<FONT color="green">043</FONT>        INTEGER(Integer.TYPE, Integer.class, 'I') {<a name="line.43"></a>
<FONT color="green">044</FONT>            public &lt;R&gt; R visit(PrimitiveSwitch&lt;R&gt; pswitch) {<a name="line.44"></a>
<FONT color="green">045</FONT>                return pswitch.caseInteger();<a name="line.45"></a>
<FONT color="green">046</FONT>            }<a name="line.46"></a>
<FONT color="green">047</FONT>        },<a name="line.47"></a>
<FONT color="green">048</FONT>        FLOAT(Float.TYPE, Float.class, 'F') {<a name="line.48"></a>
<FONT color="green">049</FONT>            public &lt;R&gt; R visit(PrimitiveSwitch&lt;R&gt; pswitch) {<a name="line.49"></a>
<FONT color="green">050</FONT>                return pswitch.caseFloat();<a name="line.50"></a>
<FONT color="green">051</FONT>            }<a name="line.51"></a>
<FONT color="green">052</FONT>        },<a name="line.52"></a>
<FONT color="green">053</FONT>        LONG(Long.TYPE, Long.class, 'J') {<a name="line.53"></a>
<FONT color="green">054</FONT>            public &lt;R&gt; R visit(PrimitiveSwitch&lt;R&gt; pswitch) {<a name="line.54"></a>
<FONT color="green">055</FONT>                return pswitch.caseLong();<a name="line.55"></a>
<FONT color="green">056</FONT>            }<a name="line.56"></a>
<FONT color="green">057</FONT>        },<a name="line.57"></a>
<FONT color="green">058</FONT>        DOUBLE(Double.TYPE, Double.class, 'D') {<a name="line.58"></a>
<FONT color="green">059</FONT>            public &lt;R&gt; R visit(PrimitiveSwitch&lt;R&gt; pswitch) {<a name="line.59"></a>
<FONT color="green">060</FONT>                return pswitch.caseDouble();<a name="line.60"></a>
<FONT color="green">061</FONT>            }<a name="line.61"></a>
<FONT color="green">062</FONT>        };<a name="line.62"></a>
<FONT color="green">063</FONT>    <a name="line.63"></a>
<FONT color="green">064</FONT>        private static final HashMap&lt;Class&lt;?&gt;, Primitive&gt; CLASS_MAP = new HashMap&lt;Class&lt;?&gt;, Primitive&gt;();<a name="line.64"></a>
<FONT color="green">065</FONT>    <a name="line.65"></a>
<FONT color="green">066</FONT>        static {<a name="line.66"></a>
<FONT color="green">067</FONT>            for (Primitive prim : values()) {<a name="line.67"></a>
<FONT color="green">068</FONT>                CLASS_MAP.put(prim.primType, prim);<a name="line.68"></a>
<FONT color="green">069</FONT>                CLASS_MAP.put(prim.wrapType, prim);<a name="line.69"></a>
<FONT color="green">070</FONT>            }<a name="line.70"></a>
<FONT color="green">071</FONT>        }<a name="line.71"></a>
<FONT color="green">072</FONT>    <a name="line.72"></a>
<FONT color="green">073</FONT>        private final Class&lt;?&gt; primType;<a name="line.73"></a>
<FONT color="green">074</FONT>        private final Class&lt;?&gt; wrapType;<a name="line.74"></a>
<FONT color="green">075</FONT>        private final char letter;<a name="line.75"></a>
<FONT color="green">076</FONT>    <a name="line.76"></a>
<FONT color="green">077</FONT>        Primitive(Class&lt;?&gt; primType, Class&lt;?&gt; wrapType, char letter) {<a name="line.77"></a>
<FONT color="green">078</FONT>            this.primType = primType;<a name="line.78"></a>
<FONT color="green">079</FONT>            this.wrapType = wrapType;<a name="line.79"></a>
<FONT color="green">080</FONT>            this.letter = letter;<a name="line.80"></a>
<FONT color="green">081</FONT>        }<a name="line.81"></a>
<FONT color="green">082</FONT>    <a name="line.82"></a>
<FONT color="green">083</FONT>        public abstract &lt;R&gt; R visit(PrimitiveSwitch&lt;R&gt; pswitch);<a name="line.83"></a>
<FONT color="green">084</FONT>    <a name="line.84"></a>
<FONT color="green">085</FONT>        /**<a name="line.85"></a>
<FONT color="green">086</FONT>         * Get the short name for this primitive type, e.g., "int".<a name="line.86"></a>
<FONT color="green">087</FONT>         */<a name="line.87"></a>
<FONT color="green">088</FONT>        public String getName() {<a name="line.88"></a>
<FONT color="green">089</FONT>            return this.primType.getName();<a name="line.89"></a>
<FONT color="green">090</FONT>        }<a name="line.90"></a>
<FONT color="green">091</FONT>    <a name="line.91"></a>
<FONT color="green">092</FONT>        /**<a name="line.92"></a>
<FONT color="green">093</FONT>         * Get the long name for this primitive type, e.g., "Integer".<a name="line.93"></a>
<FONT color="green">094</FONT>         */<a name="line.94"></a>
<FONT color="green">095</FONT>        public String getLongName() {<a name="line.95"></a>
<FONT color="green">096</FONT>            return this.wrapType.getSimpleName();<a name="line.96"></a>
<FONT color="green">097</FONT>        }<a name="line.97"></a>
<FONT color="green">098</FONT>    <a name="line.98"></a>
<FONT color="green">099</FONT>        /**<a name="line.99"></a>
<FONT color="green">100</FONT>         * Get the single character descriptor for this primitive type, e.g., "I".<a name="line.100"></a>
<FONT color="green">101</FONT>         */<a name="line.101"></a>
<FONT color="green">102</FONT>        public char getLetter() {<a name="line.102"></a>
<FONT color="green">103</FONT>            return this.letter;<a name="line.103"></a>
<FONT color="green">104</FONT>        }<a name="line.104"></a>
<FONT color="green">105</FONT>    <a name="line.105"></a>
<FONT color="green">106</FONT>        /**<a name="line.106"></a>
<FONT color="green">107</FONT>         * Get the {@link Class} object representing this primitive type, e.g., {@code Integer.TYPE}.<a name="line.107"></a>
<FONT color="green">108</FONT>         */<a name="line.108"></a>
<FONT color="green">109</FONT>        public Class&lt;?&gt; getType() {<a name="line.109"></a>
<FONT color="green">110</FONT>            return this.primType;<a name="line.110"></a>
<FONT color="green">111</FONT>        }<a name="line.111"></a>
<FONT color="green">112</FONT>    <a name="line.112"></a>
<FONT color="green">113</FONT>        /**<a name="line.113"></a>
<FONT color="green">114</FONT>         * Get the wrapper {@link Class} object for this primitive type, e.g., {@code Integer.class}.<a name="line.114"></a>
<FONT color="green">115</FONT>         */<a name="line.115"></a>
<FONT color="green">116</FONT>        public Class&lt;?&gt; getWrapperType() {<a name="line.116"></a>
<FONT color="green">117</FONT>            return this.wrapType;<a name="line.117"></a>
<FONT color="green">118</FONT>        }<a name="line.118"></a>
<FONT color="green">119</FONT>    <a name="line.119"></a>
<FONT color="green">120</FONT>        /**<a name="line.120"></a>
<FONT color="green">121</FONT>         * Get the wrapper class' "unwrap" method for this primitive type, e.g., {@code Integer.intValue()}.<a name="line.121"></a>
<FONT color="green">122</FONT>         */<a name="line.122"></a>
<FONT color="green">123</FONT>        public Method getUnwrapMethod() {<a name="line.123"></a>
<FONT color="green">124</FONT>            try {<a name="line.124"></a>
<FONT color="green">125</FONT>                return this.wrapType.getMethod(getName() + "Value");<a name="line.125"></a>
<FONT color="green">126</FONT>            } catch (NoSuchMethodException e) {<a name="line.126"></a>
<FONT color="green">127</FONT>                throw new RuntimeException(e);<a name="line.127"></a>
<FONT color="green">128</FONT>            }<a name="line.128"></a>
<FONT color="green">129</FONT>        }<a name="line.129"></a>
<FONT color="green">130</FONT>    <a name="line.130"></a>
<FONT color="green">131</FONT>        /**<a name="line.131"></a>
<FONT color="green">132</FONT>         * Parse a string value using the type's {@code valueOf} method.<a name="line.132"></a>
<FONT color="green">133</FONT>         *<a name="line.133"></a>
<FONT color="green">134</FONT>         * @param string string representation of a value<a name="line.134"></a>
<FONT color="green">135</FONT>         * @throws IllegalArgumentException if {@code string} cannot be parsed<a name="line.135"></a>
<FONT color="green">136</FONT>         * @throws IllegalArgumentException if {@code string} is null<a name="line.136"></a>
<FONT color="green">137</FONT>         */<a name="line.137"></a>
<FONT color="green">138</FONT>        public Object parseValue(String string) {<a name="line.138"></a>
<FONT color="green">139</FONT>    <a name="line.139"></a>
<FONT color="green">140</FONT>            // Handle null<a name="line.140"></a>
<FONT color="green">141</FONT>            if (string == null)<a name="line.141"></a>
<FONT color="green">142</FONT>                throw new IllegalArgumentException("null string");<a name="line.142"></a>
<FONT color="green">143</FONT>    <a name="line.143"></a>
<FONT color="green">144</FONT>            // Special case: Character doesn't have a valueOf(String) method<a name="line.144"></a>
<FONT color="green">145</FONT>            if (this == CHARACTER) {<a name="line.145"></a>
<FONT color="green">146</FONT>                if (string.length() != 1)<a name="line.146"></a>
<FONT color="green">147</FONT>                    throw new IllegalArgumentException("not a character: \"" + string + "\"");<a name="line.147"></a>
<FONT color="green">148</FONT>                return Character.valueOf(string.charAt(0));<a name="line.148"></a>
<FONT color="green">149</FONT>            }<a name="line.149"></a>
<FONT color="green">150</FONT>    <a name="line.150"></a>
<FONT color="green">151</FONT>            // Find this wrapper class' valueOf() method<a name="line.151"></a>
<FONT color="green">152</FONT>            Method method;<a name="line.152"></a>
<FONT color="green">153</FONT>            try {<a name="line.153"></a>
<FONT color="green">154</FONT>                method = this.wrapType.getMethod("valueOf", String.class);<a name="line.154"></a>
<FONT color="green">155</FONT>            } catch (NoSuchMethodException e) {<a name="line.155"></a>
<FONT color="green">156</FONT>                throw new RuntimeException("unexpected exception", e);<a name="line.156"></a>
<FONT color="green">157</FONT>            }<a name="line.157"></a>
<FONT color="green">158</FONT>    <a name="line.158"></a>
<FONT color="green">159</FONT>            // Use it to parse the value<a name="line.159"></a>
<FONT color="green">160</FONT>            try {<a name="line.160"></a>
<FONT color="green">161</FONT>                return method.invoke(null, string);<a name="line.161"></a>
<FONT color="green">162</FONT>            } catch (IllegalAccessException e) {<a name="line.162"></a>
<FONT color="green">163</FONT>                throw new RuntimeException("unexpected exception", e);<a name="line.163"></a>
<FONT color="green">164</FONT>            } catch (IllegalArgumentException e) {<a name="line.164"></a>
<FONT color="green">165</FONT>                throw new RuntimeException("unexpected exception", e);<a name="line.165"></a>
<FONT color="green">166</FONT>            } catch (InvocationTargetException e) {<a name="line.166"></a>
<FONT color="green">167</FONT>                Throwable nested = e.getTargetException();<a name="line.167"></a>
<FONT color="green">168</FONT>                if (nested instanceof IllegalArgumentException)<a name="line.168"></a>
<FONT color="green">169</FONT>                    throw (IllegalArgumentException)nested;<a name="line.169"></a>
<FONT color="green">170</FONT>                throw new RuntimeException("unexpected exception", nested);<a name="line.170"></a>
<FONT color="green">171</FONT>            }<a name="line.171"></a>
<FONT color="green">172</FONT>        }<a name="line.172"></a>
<FONT color="green">173</FONT>    <a name="line.173"></a>
<FONT color="green">174</FONT>        /**<a name="line.174"></a>
<FONT color="green">175</FONT>         * Get the value corresponding to the given Java primitive or primitive wrapper type.<a name="line.175"></a>
<FONT color="green">176</FONT>         *<a name="line.176"></a>
<FONT color="green">177</FONT>         * @return the {@link Primitive} corresponding to {@code c}, or {@code null}<a name="line.177"></a>
<FONT color="green">178</FONT>         *         if {@code c} is not a primitive or primitive wrapper type<a name="line.178"></a>
<FONT color="green">179</FONT>         */<a name="line.179"></a>
<FONT color="green">180</FONT>        public static Primitive get(Class&lt;?&gt; c) {<a name="line.180"></a>
<FONT color="green">181</FONT>            return CLASS_MAP.get(c);<a name="line.181"></a>
<FONT color="green">182</FONT>        }<a name="line.182"></a>
<FONT color="green">183</FONT>    }<a name="line.183"></a>
<FONT color="green">184</FONT>    <a name="line.184"></a>




























































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